We have been in bat dung for over a thousand years. The main ingredient of gun powder was made from it from ancient China to beyond The War of Northern Aggression. The virus is as new to them as it is to us.
We humans have been working in bat dung for at least a thousand years. It was the main source of potassium nitrate for gun powder from ancient China to beyond the Civil War. Bats' viruses have been with and in us for a long time. Something new is surmised.